/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.scheduling.config;

import org.springframework.scheduling.support.CronTrigger;

/**
 * {@link TriggerTask} implementation defining a {@code Runnable} to be executed according
 * to a {@linkplain org.springframework.scheduling.support.CronSequenceGenerator standard
 * cron expression}.
 *
 * @author Chris Beams
 * @see org.springframework.scheduling.annotation.Scheduled#cron()
 * @see ScheduledTaskRegistrar#addCronTask(CronTask)
 * @since 3.2
 */
public class CronTask extends TriggerTask {

    private final String expression;


    /**
     * Create a new {@code CronTask}.
     *
     * @param runnable the underlying task to execute
     * @param expression the cron expression defining when the task should be executed
     */
    public CronTask(Runnable runnable, String expression) {
        this(runnable, new CronTrigger(expression));
    }

    /**
     * Create a new {@code CronTask}.
     *
     * @param runnable the underlying task to execute
     * @param cronTrigger the cron trigger defining when the task should be executed
     */
    public CronTask(Runnable runnable, CronTrigger cronTrigger) {
        super(runnable, cronTrigger);
        this.expression = cronTrigger.getExpression();
    }


    /**
     * Return the cron expression defining when the task should be executed.
     */
    public String getExpression() {
        return this.expression;
    }

}
